Re: limited vs not limited?
Base Xfires are 5 grand cheaper MSRP, lighter, come with black exterior trim and fewer frills.
They generally make a better starting block for anybody who modifies cars or prefers a monotone blackout look over plastic bling and sub-par options (like broken cup holders, butt igniters, blind navigation, or a higher number of craptastic stock speakers).
That's how I saw it when I had the choice anyway.